Dirt Flagstone Installation, Concrete and Sand Questions

A person e-mailed about dirt flagstone installation, types of stone and how to measure them for his landscaping.

He wrote: Hi, very nice and helpful web site and i also ordered the DVD, however still have questions. I have a space about 20 Feet by 11.25 Feet. I have 25 existing blue flagstone, which are in deep in need of help in cleanup. When i got them i just set them on soil, than tamped it down with stone dust, it was nice, however very dirty now. I want to do this right, and i want it to look nice.

in that area i want to utilize the 25 stones that i have which are sized 2'X3' and i want the joint to be close so that nothing grows. and around the perimeter, i want to use smaller sized flagstones to accent and give it a design, along with the outside edge being pressure treated lumber.

What can i do, please let me know, i have been trying to fiure out the numbers but cant, i am not a math guy.

Answer: Dear Vinni, It sounds like you have 150 sq. feet in stone. 25 stones x 2'x3' =150 sq. feet. You'll need about 80 square feet more, so you'll need about 15 more of thoses same stone that you have now.

As far as cleaning, I would call Prosoco at 1-800-255-4255. They're cleaning experts and are very friendly.

We hope that helps!

And Roscoe from Michigan wrote:

I am replacing a flagstone walkway that runs from the street to my front porch. The walkway was installed seven years ago (in slag/sand) and over 50% of the stones have loosened. The walkway cuts across my lawn and I drive a riding mower across it weekly seven months of the year. I thought flagstone layed on concrete would be more durable, however contractors in Michigan are reluctant to do it. They site cost and cracking as the reasons for not recommending it. My primary question is whether flagstone laid on concrete is more durable than flagstone laid in slag/sand?


Dear Roscoe, As far as durability, flagstone laid in concrete is very durable. Take a look at this page:


We put that in 10 years ago and it only has a few cracks. We have a lot of settling, but it doesn't seem to affect us too much over the years. If you do have ground that expands a lot, then you might want to lay it in sand.

If you do a long walkway, you could put in a few expansion joints, however we still don't do that, because we don't like the look of it. You might get joints that crack, but they are easy to replace and you only have to do it once every few years.

The concrete underneath is about $5 to 8$ a sq. foot and the flagstone is about $15 to $25 a sq. foot.

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